Can you play versus other players?

Of course! Simply reach level 2 (by receiving experience from upgrading your cards), and once you do, you’ll be prompted to complete a Tutorial that will catch you up to speed how Duels (that’s how we call it!) work. After Captain Cloudbeard himself teaches you how to survive out there on the field, you’re good to go! Find that Duel card, and start searching for an opponent - and then brag when you win! It’s part of the fun, obviously.